Conciseness

The body is mostly efficient with concrete commands, but repeated CRITICAL admonitions and duplicated phrasing (e.g., 'do not conclude the turn by simply stating the key is missing' appears twice, and the no-leak warning is restated several times) could be tightened, matching the 'mostly efficient but includes some unnecessary explanation' anchor rather than the lean 4.

Actionability

Provides copy-paste-ready executable commands — `grep -sq "^CREDENTIAL_NAME=" ~/.env` and the `printf ... read -s ...` template — with placeholder replacement documented explicitly, covering the common verification and prompt cases, matching the 'fully executable; copy-paste ready' anchor.

Workflow Clarity

Clear sequence (verify presence first → proceed, or stop and generate a prompt command → user adds → run script) with an explicit validation checkpoint (the grep exit-code check) and an error-recovery feedback loop, but a couple of minor validation gaps keep it just below the fully-checklisted 5; this is not a destructive/batch operation so the 3-cap does not apply.

Progressive Disclosure

The skill is under 50 lines, single-purpose, has no external references, and is organized into well-signaled sections (Safe Verification, Prompting the User, Running scripts), so per the simple-skills scoring note it qualifies for 5 with well-organized sections alone.

Specificity

Names the domain (API keys/credentials) and several concrete actions — 'handling... safely', 'verifying their presence', and 'prompting the user to add them if missing' — with only minor gaps in coverage, fitting the 'lists several specific actions' anchor better than the '1-2 concrete actions' anchor at 3.

Completeness

The 'what' is clear (handling/verifying/prompting for credentials), but there is no explicit 'Use when...' trigger clause — the 'when' is only weakly implied — so per the missing-trigger-clause cap it cannot exceed 3.

Trigger Term Quality

Includes the natural terms 'API keys' and 'credentials' that users would say, but misses common synonyms and variations (e.g., 'secrets', 'tokens', 'API key' singular), matching the 'some relevant keywords but missing common variations' anchor rather than the fuller coverage at 4.

Distinctiveness Conflict Risk

Targets a clear niche (a safe credentials-handling protocol) that is mostly distinct from other skills, with only minor overlap risk against closely related secrets-management skills; it does not quite reach the minimal-conflict, distinct-trigger clarity of a 5.